Is it possible to get adaptive Width & Height after Graphics2D finish painting in paintComponent?

Question

Is it possible to get how much width and height is painted by Graphics2D instance in method paintComponent?

For example, in the following MessageUnit,

    class MessageUnit extends JPanel {
        String msg;
        JPanel msgBox;

        public MessageUnit(String msg, JPanel msgBox) {
            this.msg = msg;
            this.msgBox = msgBox;
            setPreferredSize(new Dimension(msgBox.getWidth(), 10));
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            final Graphics2D g2D = (Graphics2D) g;
            g2D.drawString(msg, 10, 30);
        }
    }

Can I get the height and width used by G2D painting the string so that I can reset size to achieve an effect similar to a responsive layout?

for example, if paining the msg occupy 100px, then I can set the width of MessageUnit to 120px so it looks like that the message is just centred.

And the next message may occupy 60px, then I set the width of the MessageUnit to 80px, it looks like that the message is centred again.

is it possible? Thanks

Answer 1

If you only need to draw a String you can get it's futur size depending of font & string itself.

public static void setSizeFromFont(Component component, Font font, String text){
    component.setSize((int)(Math.ceil(component.getFontMetrics(font).stringWidth(text))), font.getSize());
  }